T-MATRIX APPROXIMATION OF THE STOPPING POWER

An expression for the stopping power is derived in the quantum T-matri x approximation. The transport cross sections needed for a numerical e valuation are calculated using a scattering phase-shift analysis. Nume rical results are given for the stopping power of an electron beam run ning into an electron gas. The temperature and density dependencies of the stopping power are discussed. Finally, dynamical screening is inc luded in the weak coupling limit according to a kinetic equation propo sed by H.A. Gould and H.E. DeWitt.